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Looks good, but before I would drop $300+ on this I would just cut out some cardboard and and use electrical tape to tape it in between the rear headrests to see how much wind this thing would really block... If this things actually works, I have no idea why BMW didnt think of this a long time ago to retain the use of the rear seats......just my $0.02

I took thin Lexan (plexi or polycarbonate plastic) plate and U-shaped Aluminum profiles to support the plate. I just placed the deflector behind the back seat. There is still need for tune: the Lexan plate is little too thin and the U profiles too thick.

Excuse me not for taking my kids for a test drive with the top down. The outside temprerature is -8 C (18 F).

That looks terrible, kinda like a taxi cab window divider. I could only imagine at high speeds that thing flinging into the back passengers faces. ... going fast I think it's fun with all the wind blowing around...

I think the issue is wind swirling in the rear seat area and then coming forward...in our car the primary wind we feel w/the top down is coming from the rear seats via the space between the front seats and around the front head rests.

Unless you block the wind's access to the rear seat area, I don't know how you can keep the wind out of the front...at a minimum it seems like you need some sort of barrier that blocks the space between the front seats and behind the front seat head rests (if you aren't going to block the wind's access to the rear seats w/a horizontal barrier). Putting something between the rear seat headrests doesn't seem like it would help at all.

This makes me (almost) wish I hadn't spent most of my time in physics dreaming about the beautiful brunette classmate sitting one row over and two seats up from me...

It would be good to hear practical experiences from any of these solutions! My intentiation was to keep the rear seats available and I'm little hesitant to divide the front and rear rows with a plexi screen. And how the front seats operate with the plexiscreen attached to them, can yo still acces to the rear seats? If you don't care about having rear seats available, BMW OEM deflector might be a good idea.

It would be good to hear practical experiences from any of these solutions! My intentiation was to keep the rear seats available and I'm little hesitant to divide the front and rear rows with a plexi screen. And how the front seats operate with the plexiscreen attached to them, can yo still acces to the rear seats? If you don't care about having rear seats available, BMW OEM deflector might be a good idea.

You have to be careful about putting something in front of rear seat occupants that would injure them in an accident if they hit it when the car stopped suddenly, or fly forward and injure the people in the front seat. A homebrew like this seems very risky to me....

I would look closely at how Mercedes and/or Audi does it. Take some pictures, then go back to your drawing board. Based on the picture you posted, you seem to be well on your way.
As for the other stuff shown, forget about them. You don't want a windblock between the front and rear seats. That separates the two rows - like in a taxi, and I would guess makes the back seat windy as hell. The other one shown, the plexiglass between the two rear headrests, look like it would help, but at the same time the developers of that product are helping themselves to your pocket.

How about turbulence through the area between the front seats below your wind deflector - was that still present?

Glad the OEM BMW deflector I got for my wife's car is arriving today, otherwise I'd be tempted to try a DIY and would end up with a crappy result and angry wife.

there was very little to be honest and at the time I had quite long hair and without the (windjammer) in place I used to get my face whipped by my hair blowing in the wind but with it in place there was hardly any, like I said it worked!!